Frequently Asked Questions

Features

• Which database backend should I use for which databases?
• Duplicate Delivery Suppression

Installation Problems

• Compilation errors about kssl.h and krb5.h on Red Hat Linux/Fedora
• Help! There must be an easier way to get all this going...
• OpenSSL Version Mismatches

Common Feature Requests

• Does the Cyrus Murder support High Availability configurations?
• Can I configure pop3d to log amount and size of messages fetched by user?
• How can I make CyrusSieve work with public shared folders?
• Can I have subfolders not appear under INBOX?

Common Operational Questions

• How do I view ACLs on a mailbox?
• What annotations are available?
• Is it safe to put <configdirectory>/proc and <configdirectory>/lock on a tmpfs filesystem?
• How to enable core dumps
• Why can I not delete a mailbox as an admin user?
• When is What ... Deleted, Expired, Expunged or Purged?
• Why is deliver.db so large?
• I have multiple imapd-SERVICES configured and experience occasional freezes when I try to log in!
• How to run gdb on Cyrus components
• Cyrus delivers claims that the mailbox does not exist
• Why is mail being rejected with No Mailbox found due to MiXed CaSe incoming e-mail?
• Can I use MySQL (or another SQL database) as the primary mail store?
• Why do POP3 connections take so long, but once the connection is established all is well?
• Why does reconstruct -m not work?
• Shared File Systems GPFS for high availability
• How to enable telemetry
• The process count keeps growing!
• "unable to join environment" error
• Why does Cyrus set the MAIL FROM address of the sender of vacation responses to '<>'?

Common Interoperability Problems

• Why does Cyrus reject 8-bit characters in the headers of my messages?
• Why does Cyrus reject messages with "bare newlines"?
• How do I get Cyrus Sieve to play nice with Exim?
• Why does mail delivery go slow or hang sometimes?

Looking for the Cyrus SASL FAQ?